Sorry ... you have been scammed. You should get onto you credit card company and try to stop the payment, and more important cancell your card as who knows what else they may try to take off you.
Then go to
http://www.limewire.com/english/content/download.shtml where you can download LW for free in it's basic form. If you are happy you can upgrade to pro and you will IMHO get better connections and that will cost $18.88 for 6 months of updates and support.
Good luck and apology accepted
Always be careful before parting with money on the net. Many application companies allow at least a free trial period and Limewire offers more. Don't pay until you're sure!